[patch] Fix for matrix-matrix subviews

[Jules Bergmann]

This patch fixes several problems with distributed matrix-matrix subviews:

  - the get_local_block() overload for Subblock was not handling
    the case where the local processor has no subblock.

  - the Replicated_map and Global_map maps were missing several
    impl_ functions necessary to translate domains from global
    to local indices.

Distributed matrix-matrix subviews get limited use because they are 
restricted to cases where the matrix dimensions are not distributed.

This patch also includes a test case.

Patch applied.

				-- Jules

-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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